For the \(q^2\)  moments we observe a good behaviour of the perturbative series,
with coefficients precisely determined via the \(\delta \) -expansion.
Note that for the \(q^2\)  moments, even \(\alpha _s^2\)  corrections are not yet
available in the literature as the results presented in Refs. [1]}, [2]} are only for
electron energy and hadronic invariant mass moments.
